Pump.



2 SHEETS-SHEET I.

Patented Man 6,1917.

III/IIIII PUMP.

k 0 0 I P 0 I 0 0 0 O n k I L I I I I 1 I I o o I I o o o o o o o o II wu m b o 0 o O b b O o o o o I II I N VEN TOR.

A TTORNE YS.

W. S. HOLDAWAY.

APPLICATION FILED JUNE 2,1915- WITNESSES:

W. S. HOLDAWAY.

PUMP.

APPLICATION FlLED JUNE 2.1915.

Patented Mar. 6, 1917.

2 suns-SHEET 2 HH "'R1"HH IN VEN TOR.

' WITNESSES:

A TTOR NE YS.

WILLIAM s. HOLDAWAY, or sam LAKE CITY, UTAH, Assreiwon TO TWIN scnnwPUMP 00., or saw LAKE CITY, UTAH, A conronarron,

' To all whom it may concern."

Be it known that I, WILLIAM S. HOLD- AwAY, a citizen of theUnitedStates, residing at Salt Lake City, in the county of Salt Lake and Stateof Utah, have invented certain new and useful Improvements in Pumps, ofwhich the following is a specification.

. My invention relates to pumps of th screw type and :has for'its objectto provide a pump, for raisingfluid a limited distance by suction andthen to force the same fluid to any desired height, which is economicalin construction, does not require 'much power to operate, efficient inquantity of water delivered and very durable.

These objects I accomplish with the pump illustrated in the accompanyingdrawings 1n which similar letters and numerals of reference indicatelike parts throughout the several figures and as described in thespecification forming a part of this application and pointed out intheappe'nded claim.

In the drawings in which I have shown a substantial embodiment of myinvention,

Figure 1 is a top plan view of the pump,

with parts shown in section and the upper portion of the case removedand turned back adjacent.' -Fig. 2 is a side elevation of the pump. Fig.3 is a transverse vertical section on line a: m of Fig. 2; Fig. 4c is arear view bf one of the pressure disks, and Fig. 5 is an edge view ofthe other one. Fig. -6 isan end elevation of the disk casing showing therecesses therein. Fig. 7 is an end elevation of a block of metal whichis inserted in one of consists of providing screws of greater length andhaving a greater number of convolutions of threads thereon to preventany bypass of fluid from the outlet chamber -to the inlet chamber whichoccurs when only a few c'on'volutions are used, say five'or six.

Also to socushion said screws in their end- Patented Mar. 6, 1915?.

Application filed June 2, 1915. Serial No. 31,774,

wise movement or tendency that there will i be no binding of saidintermeshing screws and the end thrust of the shafts will be reduced tothe minimum of wear and friction, as well as to introduce the fluid fromabove the screws, to keep them always primed, and to provide means toclean out said chambers without stopping the pump.

The casing consists of a bottom portion A, and the top or upper portion-13 each of which has two screw channels C therein within which thescrews a and b, one right and the other leftha'nd thread, are operated.Said casings are bolted. together through flanges thereon. An end orhead D is pro-' vided on the outlet end on which is mounted the ordinarystufling boxes. Roller bearings 42' are mounted within a casing at theoutlet end which act as bearings for one end of the screw shafts 1 and'2. On the saidshaft 1' is keyed the driving pulley E and a gear wheelF, which meshes with the gear wheel v 'G, that is secured on the end ofthe said shaft 2. On the opposite end of said casings is secured thehead J, and in whichis mount/ ed the roller bearings 3 and 4 withinwhich inlet chamber K, at one end and an outlet chamber L, at the otherend. The suction pipe M, enters the said inlet chamber K at the upperside through an opening 5 and the outlet pipe N enters the outletchamber L on the upper side through an opening 6. A clean-out tap orvalve 7 is provided in the bottom of said outlet chamber L through whichany sand, grit, or other debris may be said screws and the shafts 1 and2 on which they are secured or formed, an end casing O is bolted to saidhead J by bolts as fast as it settles.

passing through another head piece P and through the rim of said casinginto the said head J, and ball bearings 8 are mounted in said head pieceP against which the ends of said shafts bear. The said ball bearings arecarried in recesses formed in the end of said head piece P, and areintended to prevent any tendency of said shafts to move endwise byreason of the load of said pump. The friction on said ball bearingsvarying as the lift of water may increase or decrease. The forcing loadof said screws would cause a great end thrust or movement unless counterbalanced and for that purpose and to prevent the end thrust due to theforcing load, I provide two pressure chambers within said casing 0 shownat 9 and 10. \Vithin said chamberl) is operated a disk 11 which issecured on the end portion of said shaft 1 by having a sleeve hub 12secured thereon and bearing against a shoulder 13 out on said shaft. Asimilar disk ll is secured on the end portion of said shaft 2, theonlydifference in said disks being that the sleeve hub 15 is longer than thesleeve hub 12. The said disk 14 is operated in the other pressurechamber 10. A pressure pipe 16 connects the outlet pipe N with saidpressure chambers 9 and 10 and the pressure of the fluid carried in saidpipe-N bears against the said disks lland 1a with a force equal to thatbearing against the screws a and 6 respectively. The face of each diskbeing of such size that its pressure face is equal to the pressurefaceof the screw carried on its respective shaft. A leakage pipe 17 connectsa leak recess 18, which is cut in the rear face wall of each of saidpressure chambers 9'and 10, with the inlet pipe in order that any fluidthat may pass said disks will not accumulate in the chamber but will bedrawn off For convenience in construction the said pressure chamber 9 isbored into said casing O and an opening is concentrically bored from thebottom of said pressure chamber 9 through said casing 'to receive thesleeve hub 12. A block of metal 20 is then closely fitted and secured inand filling the upper portion of the hole thus bored in forming the saidpressure chamber 9. The pressure chamber 10 is then bored, with theconcentric opening within which said sleeve hub 14 is operated. It willbe obvious that the endwise thrust on the said screws a and b will beequalized by the pressure on the said disks 11 and 14 whether the fluidin the pipe N is 5 feet above the pump or one hundred and fifty feet.The pressure on either end being the same regardless of the height towhich the fluid is raised.

Having thus described my invention, and shown a novel screw and easingtherefor and a novel means of preventing endwise thrust of the screwsand of the shafts 1 and 2 and of constructing bearings for said shafts,I desire to secure by Letters Patent and claim A pump comprising aseparable casing having a bearing chamber in each end portion; rollerhearings in said chambers; parallel shafts mounted on said bearings; in-

termeshing screws on said shafts and revoluble therewith and with theirends spaced from the ends of the interior of said casings to form anoutlet chamber at one end and an I inlet chamber at the other endintermeshing gears on said shafts; a suction pipe connected withtheinlet chamber and an outlet pipe connected with the outlet chamber;another casing secured on the end of the first mentioned casing andprovided with pressure chambers each of which is connected with saidoutlet pipe; pressure disks secured on said shafts and operable insaid'pressure chambers; and ball bearings carried in sockets in saidpressure chambers against which the ends of said shafts may bear.

In testimony whereof I have aflixed my signature in presence of twowitnesses.

WILLIAM S. HOLDAWAY.

